Gearing.



H. E. DEY.

(BEARING.

APPLICATION FILED FEB. 20. 1915.

mm Nov, 2, 1915.

7? TED STA Jule.

v7 JERSEY.

GEABIBTG.

Specification of Letters Patent.

Original application filed January 18, 1912, fierial N 0. 671.98 Divided and this application filed February 2a, 1915. Seriel-i-1o.9,765.

To all whom it may concern:

Be itknown that I, HARRY E. Der, a citi- Zen of the United States, residing in Jersey City, in tne county of Hudson and State of New Jersey, useful improvements in Gearing, of which the following is a specification.

The object of this invention is to change the speed ratio, either in a like or a reverse direction, of two rotating parts mounted upon an axis common to both. My invention accomplishes this in a very compact and ellioient manner.

My present application for patent is a division of my pending application Serial Number 671,99e, filed January 18, 1912.

Referrin to the accompanying drawings which are designed to illustrate one of the several ways in which my invention can be used: Figure 1 is a longitudinal sectional view of an axle containing a specially de signed electric motor, in which both the armature and the field magnet rotate, and the mechanical movement upon which the invention is based; Fig. 2 is across section taken on the'line AB; Fig. 3 is a cross section taken on line CD; Fig. at is a cross section on line E-l; Fig. 5 shows an alternative hub that may be substituted for the one shown in Fig. 1.

I prefer to use a motor in which the field magnet and the armature both rotate, and thus, by connecting the field to drive one wheel and the armature to drive the other, avoid the use of a differential gear for independent rotation, for' the motor then acts as a perfect differential device. As the armature and the field rotate in opposite directions the reduction gearing has to be so constructed that the motion of one element is reversed in transmitting to the wheel, while that of the other element is transmit ted without change of direction.

The motor is preferably mounted with its axis coinciding with the center line of the axle; and in its construction differs from most motors by raving its field magnet inside, and the armature outside in the form of a Gramme ring. This form of construction produces a motor very light in weight for a given power, and also has great cooling advantages combined with water-proof construction.

The field magnet 1 is mounted upon the shaft 2, and is energized by coil 3. Collecthave invented certain new and,

and terminates in the rotary shaft 16, of

is rigs which it is apart. An eccentric latented Nov. 2.

and l. serve to take idly carried b v, being keyed, upon the shaft"- 10, and sleeved over the eccentric 1s a set oi? rollers 12, comprisin roller bearing: lhe

latter is surrounded by a casing 13, having an enlarged portion projecting the ends of the rollers and inclosing a gyratory gear of the internal type 14, which meshes with gear 15. As shown in the drawings the gear 14 is thus, in eli'ect, rotatably carried by the eccentric member in a planetary orbit, the rollers relieving friction and facilitating slight play between the parts. The gear 15 is of the external type and is fixed to the axle, being thus unrotatably supported thereby. The roller bearing 16, shown inside of gear 15, is used for supporting the shaft 10, which is, as shown, located proximate the longitudinal c nter of the axle. The casing 13, has an extension opposite the gear end with which is universally jointed a member,-shown in "the drawings as a Garden shaft 17.

The unrotatable axle is made up from the assembly of the "framework, a, gear casings lg and Z), the tubular sections 0 and c, and the yokes (Z and (Z. The latter is not shown, as the two hubs and attachments are duplicates.

The cylindrical piece 19, is, proximate one of the ends of the axle, trunnioned in the yoke (Z, and carries within it the ball bearings. 20 and 21, inside of which is rotatable the cylindrical part, or driven membe 22, with which is universally jointed the other terminal end of the Garden shaft 17, 22 being thus supported by the axle independently of the shaft 10. 22 is rigidly attachedto the hub of the Wheel 23 by means of the pin 2%.

It will be noted that the construction is such that the driving shaft 10 does not carry the driven member 22. That is to say the driven member is independent of the shaft which transmits power to the gyratory driving gear 1%, except in so far as said driven which is likewise constantly influenced by,

and universally jointed with, the gyratory driving gear at approximately the latters axis of rotation. It results that the said connection, or shaft, is always inclined relatively to both of said axes, and rotates on'its own axis while moving in what is substantially a cone-shaped path, the apex of which coincides with the axis of rotation of the driven member and its base with the planetary orbit of the gear 14. It will also be noted that the said means employed to so unite the gyratory driving gear with the driven member, are, as indicated by the universal joints of the Garden shaft, universally flexible, relatively to the parts thereby operatively joined. These noted features of the construction serve to increase power efliciency, to abort shocks transmitted from the wheel 23, to insure regularity of movement in the driving mechanism, and

" to dispense with straightening out devices ferent points of the for the type of gears referred to.

Mounted upon the field shaft 2, is the eccentric 11, which is supported by the roller bearing .16. Sleeved upon the eccentric portion is the external gear 1a with the roller bearing 12' inserted between them. This gear (1 1) meshes with the internal gear 15, which-is fixed to the unrotatable axle 18. Gear 14 is provided with the universal joint extension in the same manner as in gear 14, and from this point wheel the c nstruction is a duplicate of the other end of the axle. I

The operation of the mechanism is as fol lows: Eccentric 11, which is mounted on the armature shaft, rotates and carries with it gear 14;, the pitch line rolling around the pitch line of gear 15. If both gears were supplied with the same number of" teeth, gear 14 would have no rotary motion and would simply keep contacting around difperiphery, but, as the larger gear has a greater number of teeth it is caused to rotate upon its own axis, in the same direction as the driving gear, at a slow speed of revolution; the nearer the diameters are to being equal, the slower the gear 1d will rotate; in otherwords, the greater the speed ratio'of reduction will be. The

around the center line of the axle, with a radius equal to the eccentricity of the eccentric.

Gearing of this type up to this point is not new, but the former methods of transmitting the power from the rotary gear has met w1th the objection that it had low power eflieiency and the motion was irregular, unless two additional gears were inserted. By

to the 4.

transmitting the power by means of a universal jointed shaft, however, the motion is absolutely uniform, and, as I have found by experience, is very efficient. The Garden shaft 17 yieldingly transmits the power from the gear to the hub of the wheel, as will readily be seen from the drawing.

In transmitting the power from the field shaft it is desired to reverse the direction .of rotation, and to accomplish this the folin a fork of the axle with all provisions made for the combined steering and driving. In Fig. 5, I have shown the construe tion as it would be with the steering pro vided for in a separate axle.

It will be obvious. that my said invention is applicable to speed differentiation in other connections and forother purposes than as above specifically described. For example, it may be employed in connection with electrical, or other power, means to drive a single propelling element, as for example, the propeller of a motor boat, etc.

'I claim as my invention:

1. In combination in a vehicle, an axle; a driving shaft supported by said axle proximate its longitudinal center; means to rotate said shaft; an unrotatable gear of the internal type supported by said axle and concentric with said shaft; a gyratory gear of the external type carriedby said shaft andin mesh with said first mentioned gear; a tractor wheel supported by said axle proximate one of the ends thereof; and means, comprising a universally jointed shaft, to, constantly, 'opcratively, unite the hub of said wheel with said gyratory gear.

2. In combination, a driving shaft; means to rotate said shaft; an unrotatable gear of the internal type concentric with said shaft; a rotatable gear of the external type carried eccentrically by said shaft and in mesh with said first mentioned gear, a driven member, means to rotatably support said driven member independently of said driving shaft, and means, comprising a universally jointed shaft, to operatively unite said driven memher with said rotatable gear.

3. In a speed-reducing power transmission device, a rotatable driven member; a rotatable gear having its axis of rotation eccentric to the axis of rotation of said driven member; an unrotatable gear meshing with said rotatable gear; means to rotate .said rotatable gear on its said axis and to simultaneously gyrate it in a planetary orbit; and means, comprising a shaft inclined relatively to both said axes, to transmit power from said rotatable gear to said driven member.

4. In a speed-reducing power transmission device, a rotatable driven member; a rotatable gear having its axis of rotation eccentric to the axis of rotation of said driven member; an unrotatable gear meshing with said rotatable gear; means to rotate said r0- tatable gear on its said axis and to simultaneously gyrate it in a planetary orbit; means totransmit power from said rotatable gear to said driven member; and, constituting a part of said last mentioned means, a shaft disposed to rotate in a cone-shaped path, the apex of which coincides with the axis or the driven member and its base with the planetary orbit of said rotatable gear.

5. In a power transmission device, 3 r0 tatable driven member and a rotatable driv' ing member having their-axes mutually eccentric; means to gyrate said driving member in a planetary orbit; unrotatable means to rotate said driving member whilfe so gyrating; and means, comprising arrotating shaft inclined relatively to both said axes, to transmit power from said driving to said driven member.

6. In a power-transmission device, two rotatable members having their axes mutually eccentric; means to 'gyrate one of said members in'a planetary orbit; relatively stationary meansto rotate said last mentioned member while so gyrating; and means, comprising a rotating shaft inclined relatively to both said axes, to transmit power from said gyrated member to the other.

7. In a power transmission device, two

I rotatable members having'their axes mutually eccentric, means to gyrate one of them in a planetary orbit; relatively stationary A,

means to meanwhile rotate the member so gyrated; means to transmit power from one to the other of said members; and, constituting a part of said last mentioned, means, a shaft rotating on its own axis while moving through a cone-shaped path, the apex of which coincides with'the axis of one of said rotatable members and its base with said planetary orbit of the other.

8. A mechanical movement comprising an eccentric, a gear adapted to rotate upon said eccentric, a constantly stationary gear with which said rotative gear meshes, and a universally jointed shaft connecting the said rotative gear with any desired mechanism to drive the same.

HARRY E. DEY.

Witnesses:

PHILIP C. BECK, WILLIAM J. HOPKINS.

Gopies of this patent may be obtained for five centseach, by addressing the Commissioner of Patents, Washington, D. C 

